Hey virtthemaest,I am currently using GH Flora series (gro,micro,and bloom)in a DWC grow that have and they work VERY good.However I am also using Pure blend pro along with a catalyst and Floralicious for a soil grow and those results are EXCELENT so far.Pure Blend Pro has a soil as well as a hydro formula if you are intrested.As far as flushing,I went from veg to flower without flushing and just using the recomended doseages for the transition phase for about a week before adding only the flowering formula.I do however plan on flushing for about 2 weeks before harvest.Good luck!!